Had you experienced any problems with the DS resetting when inserting the SC? Can't get past that. Maybe it's different DS firmware - mine's v3.
I want to be happy too
Low battery's not the issue, mine was plugged into the charger. Looks like it's the hardware:
http://gbatemp.net/index.php?showtopic=35370
My chip is a CB. But yeah, always plug in when updating firmware.
Same here, stalled around 31%. Tried copying across the 1.62 firmware and renaming to UPGRADE.scu, but it won't accept it - "It isn't accurate upgrade file". I wonder if there's a version number inside the file that's stopping the downgrade.
*sigh*